Samix Traxxas TRX-4 Servo Horn (Black) (25T)

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The Samix Traxxas TRX-4 Servo Horn is a double clamp lock style horn developed specifically for TRX-4 trucks. Precision machined to exacting specifications, this horn matches the TRX-4 geometry perfectly and is a great upgrade. The arm features a unique shape and dual clamp design that will keep the horn locked securely to the servo output. Package includes one 25 tooth servo horn and clamp lock hardware.


  • Machined from high quality aluminum
  • Clamping head for secure mounting in high stress applications
  • Clamp hardware included
  • Available in multiple color options with laser etched samix logo
  • Available in 23T and 25T servo applications

This product was added to our catalog on December 19, 2017

Tuesday, Oct 2 2018 (about a year ago)
Samix Traxxas TRX-4 Servo Horn (Black) (25T)
Super nice design with the double clamping screws. Excellent quality and fits my Protek Black series 370TBL crawler servo perfectly. Even with 650 oz-in of torque it has no problems...

#UPDATE# After using 4 different servos over the last year in my TRX4, all with this same Samix horn, the Protek 370TBL is the only servo that wasnt touching the servo horn when steering at least one direction. The current Savox SA-1283SG aluminum case servo had such littke clearance that it ended up binding and stripping the splines on the servo horn. Seems like it just sits about 1mm too low...
Verified Owner
Monday, Jul 1 2019 (9 months ago)
Samix Traxxas TRX-4 Servo Horn (Black) (25T)
Does not work well with the Savox 1283SG
horn touches the servo case and the chassis/brace at full lock
Center is also off half a spline